Clenching nail or tack.



PATENTED JAN. 17, 1905.

P. W. PRATT. GLINGHING NAIL OR TACK. PPLIOATION FILED MAR. 1s, 1904.

llNiTEn STATES.

Patented January 17, 1905.

PATENT OEETCE.

cTENcHiNe. NAH. oa TACK.

SPECIFICATION forming part of Letters Patent No. |`80,063, dated January1'?, 1905.

Application led March 16, 1904. Serial No. 198,412.

To rtl/f whom, t may concern:

Beit known that l, PHILIP W. PRATT, of Boston, in the county of Suffolkand State of Massachusetts, have invented certain new and usefulImprovements in Clenching Nails or Tacks, of which the following' is aspecification.

This invention relates to fastening devices of that type known asclenehing' nails or tacks, such devices being most commonly employed foruse in the manufacture of boots and shoes. y

My present invention is also particularly adapted for use in connectionwith boots and shoes, such as an aid for securing in place heels orsoles which have heretofore mainly relied upon cement for attachingthem.

The object of my invention is to provide a clenching nail or tack soconstructed that the;I outer end thereof will be upset or spread byp`the wear, so as to maintain a head or bur ofi; greater diameter than thenail, such head bear-,i ing on the outer surface of a rubber solei whichhas been cemented to aleather sole and(y aiding the cement in holdingthe rubber sole in place.

A further object of the invention is to provide a structure of nail ortack which as it wears away will continue to present a bur of antislipmetal, such as lead.

To these ends the invention consists in the nail or tack substantiallyas hereinafter described and claimed.

Of the accompanying' drawings, forming' a part of this specification,Figure l is an enlarged view representing a nail in section constructedaccording to my invention. Fig.

2 represents a section on line 2 2 of Fig. 1.,.

Fig. 3 represents the same nail after it hasl` been partially worn down.Fig. 4 represents a nail embodying' my invention and illustrating' oneof the uses to which said nail may be i put, a portion ofthe shellbeing'broken away to show thelead lilling or core.

form a point and the other end being left either cylindrical or slightlyflared outward to form a head, as shown at a in Fig'. l. The core mayconsist of a piece of lead wire which has been rolled up within theshell a. I do not limit myself specifically, however, te the use of leadas the iilling or core, as similar soft metal may be employed. I preferlead, however, on account of its antislip qualities.

Then the nail has been partially worn down, as shown in Fig. 3, the heada of the shell, if any such head has been provided, has been worn awayand the ductile metal of the core is upset or spread over the shell, soas to form an enlarged head of the core itself which will not only aidin holding anything, such as a rubber sole, but also forms an enlargedantislip surface. ln Fig. 4 l show the nail as employed in holding arubber sole d against a leather sole c. 1vln emliiloying this nail ortack for aiding in securing a rubber sole toleather an awl or a similartool will preferably be llrst employed to form a hole in the leather, soas to receive the nail. This is because l preferably employ a shell ofsuch thin metal that the nail would not be self-penetrating in leather.If the nail were to be driven simply into rubber or into some kinds ofcomparatively soft wood, the thin metal of the shell gives amplestreiigtl'i for driving pu rpeses without doubling' the nail uponitself. Of course the chief utility of the shell a is to strengthen thesoftfmetal core, so as to enable it to be driven. 1 intend to employmetal so thin that when pressure is exerted thereon in the use of thearticle in which the nail is driven the said shell will be quicklybroken down or worn away, so as to permit of the lateral spreading orupsetting of the core to form the head L, as described.

As shown in Fig. 5, the upper end of the shell may be liared somewhat inthe form of a screw-head or of some types of nail-heads, and an enlargedportion of the core I; will fill the enlarged or flared head portion ofthe shell. As also shown in said Fig. 5, the nail may loe of a taperingform from end to end 2. A clenehing nail or tack comprising a instead ofhaving parallel sides, as shown in sheet-metal shell pointed at one endand hav- Fig. l. ing a flange or head at the other end, and a Whateverthe form of nail in which the inlead Core or filling Within Said shell.I5 5 vention is embodied the shell may be eorru- In testimony whereof Ihave affixed my siggated for a portion of its length, as indicatednature in presence of tWo Witnesses.

at 2 131g- 5- PHILIP W PRATT I claIIn- 1. A elenehing nail or tackcomprising a Witnesses:

IO shell of thin metal pointed at one end and hav- A. W. HARRISON,

ing a core of relatively soft metal. R. M. PIERsoN.

